Nosy novice at space administration (5)
I believe the answer is:
nasal
'nosy' is the definition.
(relating to the nose)
'novice at space administration' is the wordplay.
'novice' becomes 'L' (as in a learner driver with L-plates on their car).
'at' means one lot of letters go next to another (I've seen this in other clues).
'space administration' becomes 'nasa' (I can't justify this - if you can you should give a lot more credence to this answer).
'l' put after 'nasa' is 'NASAL'.
Can you help me to learn more?
(Other definitions for nasal that I've seen before include "Sniffer's" , "regarding the nose" , "of a prominent feature" , "Like some spray" , "piece of armour" .)